Advanced Qualification · A-002 Advanced components and circuits · A-002-009-002
What are the principal frequencies that appear at the output of a mixer circuit?
- AThe sum, difference and square root of the input frequencies
- BTwo and four times the original frequency
- CThe original frequencies and the sum and difference frequencies
- D1.414 and 0.707 times the input frequencies
Correct answer: C — The original frequencies and the sum and difference frequencies. From the official ISED question bank, verified word for word.
Why
A mixer combines two input signals to create new ones, specifically producing the sum and difference of those input frequencies, while the original signals often remain present at the output. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits is section A-002 of the Advanced exam: Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.
Drill A-002 — free, no account